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Stier was born in Buenos Aires, Argentina[1] and lived in the middle-class Flores district (the same of Pope Francis)[2] in a Croatian expatriate family originating from Samobor.[1] His paternal grandfather Ivan Stier was a Ustaše colonel and assistant to Vjekoslav Luburic who escaped to South America after World War II.[3] His other grandfather, Milorad Lukač, was one of the leading emigrant politicians of the Croatian Peasant Party. Stier's father was a doctor and his mother Marija Lukač was a university professor.

Stier returned to Croatia in 1996 at the invitation of the Ministry of Foreign Affairs, after which he worked in the Croatian embassies in Washington and Brussels, and by 2009 was foreign policy adviser to Prime Minister Ivo Sanader.[3]

At the 2011 parliamentary elections, Stier was elected as a member of the Croatian Parliament.[4] He became a member of the Interparliamentary Cooperation Committee and the Committee for European Integration, and was appointed Vice-Chairman of the Foreign Policy Committee. He was also nominated as a member of the Croatian Parliament delegation at the NATO Parliamentary Assembly and the Croatian Parliament delegation at the Joint Parliamentary Committee of the Republic of Croatia. [5]

Stier was one of the closest associates of Jadranka Kosor and his adviser and delegate for Euro-Atlantic cooperation. At the time of Slovenian-Croatian diplomatic freeze, Stier was the main participant of a behind-the scenes diplomacy effort and mediator between Kosor and Slovenian Prime Minister Borut Pahor.[3] At the May 2012 HDZ leadership contest, Stier supported Tomislav Karamarko[6] but later opposed to the disciplinary proceeding against Jadranka Kosor in February 2013 after the party decided to sanction her because of her appearances in the media.[7]

In September 2012, Stier asked the Croatian government to give up the ratification of the state border dispute between Croatia and Bosnia and Herzegovina, claiming that in so doing Croatia would have agreed to blackmail politics and linked European Union membership to border issues. He accused Bosnia and Herzegovina's Transport Minister Damir Hadzic of blackmailing the Croatian government by stating that Bosnia and Herzegovina would not allow the construction of the Peljesac bridge unless Croatia ratified the border agreement. [8]

In April 2013, Stier said that the condition for Bosnia and Herzegovina to enter the European Union would be the institutional equality of Croats in Bosnia and Herzegovina. [9]

Following Croatia's EU accession, at the first elections to the European Parliament in Croatia in April 2013, Stier won 14 005 votes on the list of the HDZ coalitios that were still made by HSP AS and BUZ. With 5.75% of votes cast, he became one of the first Members of the European Parliament from Croatia.[11][12] At the session of the European Parliament's Foreign Policy Committee in July 2013, Stier requested that the European Union more strongly support the right of the Croatian people in BiH to equality with other constituent peoples and thus internationalize the "Croatian issue" in BiH. In an interview for Večernji list in the same month, Stier stated that Croats in BiH are an unavoidable and decisive factors in the Europeanization of Bosnia and Herzegovina and said that the role of the European Union in Bosnia and Herzegovina is crucial and that cooperation with Russia and Turkey is welcome. [13]